Understanding of DRM

DRM: Dynamic Resource Management, or Dynamic Resource master, which is easier for beginners to understand. This concept was introduced at 10 Gb. Each instance of Oracle RAC has its own SGA, which stores the recently used cache. RAC uses the DRM mechanism to ensure data consistency and uses cache fusion to maintain data consistency.

DRM was improved in Version 10.2. In 10.1, a cached master can only belong to one node. In 10.2, RAC modifies the cached master Based on the Cache Usage frequency.